EP0878634A1 - Vibration damper for vehicle brakes - Google Patents

Vibration damper for vehicle brakes Download PDF

Info

Publication number
EP0878634A1
EP0878634A1 EP98303592A EP98303592A EP0878634A1 EP 0878634 A1 EP0878634 A1 EP 0878634A1 EP 98303592 A EP98303592 A EP 98303592A EP 98303592 A EP98303592 A EP 98303592A EP 0878634 A1 EP0878634 A1 EP 0878634A1
Authority
EP
European Patent Office
Prior art keywords
vibration
high voltage
piezoelectric elements
control circuit
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98303592A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yukio c/o Itama Works Nishizawa
Shiro C/O Itami Works Nakajima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Publication of EP0878634A1 publication Critical patent/EP0878634A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/0006—Noise or vibration control
    • F16D65/0012—Active vibration dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/005—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion using electro- or magnetostrictive actuation means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2129/00—Type of operation source for auxiliary mechanisms
    • F16D2129/06—Electric or magnetic
    • F16D2129/12—Electrostrictive or magnetostrictive elements, e.g. piezoelectric

Definitions

  • This invention relates to a vibration damper for vehicle brakes which can prevent squeals of a vehicle wheel brake produced during braking.
  • a wheel brake tends to squeal during braking.
  • Various means have been proposed to prevent such brake squeals.
  • brake vibration dampers disclosed in unexamined Japanese patent publications 4-54324 and 4-54325 are known.
  • the former publication discloses a vibration damper having a piezoelectric vibrator for applying inaudible vibration to friction members (pads), and another vibration damper comprising a piezoelectric detector for detecting vibration of the friction members, and a piezoelectric vibrator for applying inaudible vibration to the pads only while the detector is detecting vibration of the pads.
  • a vibration damper including a piezoelectric vibration detector for detecting vibration of the friction members, and a vibrator means for vibrating the friction members to dampen their vibration according to the detected vibration.
  • the vibrator applies vibration 180 ° out of phase from the vibration detected.
  • both the above two piezoelectric elements are used.
  • the vibration damper systems disclosed in the above two publications apply inaudible vibrations through piezoelectric elements, or vibrate friction members through piezoelectric elements according to the vibration detected to dampen vibration. These systems have various problems.
  • Piezoelectric elements are polarized to produce electric characteristics when pressure is applied to a crystal of e.g. piezoelectric element ZnO 2 , and produce piezoelectricity when the above process is reversed. It is preferable to use piezoelectric vibration detector and vibrator having as large a piezoelectric effect (piezoelectric constant) as possible.
  • Curie temperature is a critical temperature at which a piezoelectric element loses its spontaneous polarization properties and thus its piezoelectricity. Once a piezoelectric elements loses its piezoelectricity, its original properties are not restored simply on cooling down to normal temperatures.
  • the temperature around piezoelectric elements mounted in brake caliper can rise to 200°C or higher. If the ambient temperature approaches or exceeds the Curie temperature of the piezoelectric elements, their performance deteriorates quickly.
  • a vibration damper system for a vehicle brake including a vibration detector means comprising piezoelectric elements for detecting vibration produced when a rotary member of the wheel brake is braked by a friction member, a control circuit, and a vibrator means comprising piezoelectric elements, said vibration detector means transmitting a vibration damping signal based on the detected vibration to said vibrator means through said control circuit to suppress vibration,
  • the vibration damper system further comprises a high voltage source and a plurality of changeover means provided along a signal line connecting each of said piezoelectric elements of said vibration detector means and said vibrator means to said control circuit, said control circuit transmitting a changeover signal to at least one of said changeover means in response to a timing signal input into said control circuit to apply high voltage to one or all of said piezoelectric elements from said high voltage.
  • piezoelectric elements that have deteriorated in performance and thus have collapsed orientation of polarization can have their polarization restored by applying a DC field. Accordingly with the wheel vibration damper system of this invention, even if the performance of the piezoelectric elements deteriorates due to high temperatures, restoration of such performance is possible, and intended vibration damping function is expectable. Performance deterioration of piezoelectric elements is mostly due to high temperatures. But even for deterioration due to collapse of polarization orientation for other causes, piezoelectric elements can restore polarization properties and recover piezoelectricity by applying high voltage.
  • the vibration damper system applies vibration corresponding to the vibration detected by the vibration detector through the vibrator to cancel and suppress vibration. But if the piezoelectric elements are subjected to high temperature due to repeated braking, they will lose their piezoelectric properties.
  • the vibration damper system according to this invention is provided with a changeover means in signal lines connecting each piezoelectric element to the control circuit.
  • a changeover means in signal lines connecting each piezoelectric element to the control circuit.
  • Fig. 1 is a partial section of a disk brake having a vibration damper embodying the invention.
  • the disk brake shown has an opposed type caliper 1.
  • brake pistons 2 are mounted in the caliper 1.
  • a fixing piston 5 is received in each brake piston 2.
  • Vibration detectors 7 and vibrators 8 are bonded or otherwise fixed to the fixing pistons 5 and adapted to be pressed against pads 3 by the respective pistons 5.
  • the pads 3 are brought into frictional contact with a disk rotor 4.
  • Each fixing piston 5 is inserted in the respective brake piston 2 so as to be slidable in the axial direction of the disk with its outer periphery sealed by a piston seal.
  • Brake fluid pressure in a fluid chamber of the caliper 1 is applied to the rear end faces of the brake pistons 2 and the pistons 5 to advance the pistons 5, thus pressing the vibration detectors 7 and the vibrators 8 against the pads 3.
  • machining accuracy of brake parts has no influence on the pressures at which the detectors 7 and vibrators 8 are pressed on the pads. For example, even if the thicknesses of the detectors 7 and vibrators 8 are not so precise, accurate detection and application of vibration are possible.
  • Fig. 2 is a block diagram of the entire vibration damper system for the disk brake shown in Fig. 1.
  • the vibration damper shown has a control circuit 10 which, based on vibrations detected by the vibration detectors 7, transmits a signal to the vibrators 8 to damp vibrations and suppress brake squeals.
  • the control circuit 10 also has the function of restoring the piezoelectricity of one or some of the vibration detectors 7 and vibrators 8 by applying a high DC field to their piezoelectric elements if the circuit 10 receives a timing signal which is produced in a piezoelectricity restoring phase.
  • the vibration damper of this invention has a high voltage source 11 for generating a high voltage using the car battery for actuating the control circuit 10.
  • switches 12a, 12b are connected to detection signal lines A+, A- of each vibration detector 7 so as to be changed over in response to signals through signal lines a1, a2 from the control circuit 10 so that high voltage can be applied through lines B+, B- from the high voltage source 11.
  • the high voltage source 11 shown is a DC-DC converter which steps up 12 V produced by the battery to 60 V.
  • the control circuit 10 activates the piezoelectricity restoration operation while the vehicle brakes are being applied with the vehicle either in motion or at a stop. The fact that the brakes are being applied is detected by a brake actuation detector 13 for detecting the pressure in the master brake cylinder MC.
  • the control circuit 10 receives the signal from the detector and activates the piezoelectricity restoring phase at one of the following five timings:
  • a signal is transmitted to the circuit 10 from the ignition (IGN) switch 14, a travel distance counter 15 or a counter 16 for counting the number of times the brakes are applied.
  • a piezoelectricity restoration function trigger signal (5 V signal) is applied for a predetermined time period to the switches 12a, 12b from a one-shot multivibrator provided in the control circuit 10.
  • a trigger signal is produced based on the signal of the brake pressure detector 13 to apply high voltage to the piezoelectric elements from the one-shot multivibrator for a predetermined time.
  • a trigger signal is produced by e.g. a comparator to apply high voltage to the piezoelectric element from the one-shot multivibrator for a predetermined time period.
  • a trigger signal is produced by e.g. a comparator to apply high voltage to the piezoelectric element from the one-shot multivibrator for a predetermined time period.
  • the piezoelectric elements as the vibration detectors 7 detect vibration of the disk rotor 4 through one of the pads (e.g. inner pad). Based on the signal from the vibration detectors, the control circuit 10 adjusts the phase and amplitude of vibration and applies vibration that is opposite in phase to the vibration of the disk rotor 4 to the other pad (e.g. outer pad) and thus to the disk rotor 4 through the piezoelectric vibrators 8 to suppress vibrations of the disk rotor and thus brake squeals.
  • the temperature in the caliper 1 tends to rise due to friction heat. This deteriorates the piezoelectric characteristics of the piezoelectric elements.
  • the piezoelectricity restoration command signal applied to the switches 12a, 12b is normally 0 volt (low level), thus connecting + and - terminals of the piezoelectric elements to the control circuit 10 through the switches 12a, 12b.
  • control circuit 10 may be provided with a program for measuring the capacitance of each piezoelectric element, comparing it with a reference capacitance and specifying any deteriorated one.
  • the piezoelectricity restoration phase starts at a timing when one of the above-listed five conditions is met.
  • Fig. 3 shows how a piezoelectric element that had deteriorated in piezoelectricity due to the temperature rise at the pad linings to 250°C restored piezoelectricity by applying a high DC field.
  • 60 V was applied for about one second to the piezoelectric vibration detector or vibrator.
  • the vertical axis indicates the degree of performance deterioration compared with the initial squeal-suppressing performance. From this graph, it is apparent that the performance of the sample dropped by more than 25% from the initial performance and then restored almost completely. It is possible to restore performance by applying voltage only for a short time. Thus, the energy needed for performance restoration is small.
  • Degree of performance deterioration (%) ((capacitance of piezoelectric element at evaluation - initial capacitance of piezoelectric element)/initial capacitance of piezoelectric element) ⁇ 100
  • the piezoelectric element used in this measurement could withstand a voltage of 150 V.
  • the vertical axis indicates the degree of performance deterioration in terms of capacitance compared with the initial value. From the graph, it is apparent that the application of a voltage of 60 V or more is enough to restore the performance.
  • the vibration damping rate changed from the initial damping rate of 0.31 times to 0.62 times when deteriorated. It returned to 0.32 times after the performance restoration treatment. Thus, the deterioration effect was about 100%.
  • the piezoelectric elements can restore piezoelectric properties by applying high DC voltage.
  • the reliability and durability of the piezoelectric elements can be improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Braking Arrangements (AREA)
  • Vibration Prevention Devices (AREA)
EP98303592A 1997-05-12 1998-05-07 Vibration damper for vehicle brakes Withdrawn EP0878634A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP120995/97 1997-05-12
JP9120995A JPH10311354A (ja) 1997-05-12 1997-05-12 車両ブレーキ用制振装置

Publications (1)

Publication Number Publication Date
EP0878634A1 true EP0878634A1 (en) 1998-11-18

Family

ID=14800185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98303592A Withdrawn EP0878634A1 (en) 1997-05-12 1998-05-07 Vibration damper for vehicle brakes

Country Status (4)

Country Link
US (1) US6125974A (ja)
EP (1) EP0878634A1 (ja)
JP (1) JPH10311354A (ja)
KR (1) KR19980086867A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001002744A1 (de) * 1999-07-06 2001-01-11 Robert Bosch Gmbh Verfahren zur variation der bremskraft einer fahrzeugbremse und fahrzeugbremse
DE10313990A1 (de) * 2003-03-27 2004-10-28 Daimlerchrysler Ag Verfahren sowie Vorrichtung zur Reduktion von Bremsgeräuschen
KR100897111B1 (ko) * 2002-11-25 2009-05-14 현대자동차주식회사 차량의 진동소음 저감구조
CN106641027A (zh) * 2016-12-01 2017-05-10 陕西法士特齿轮有限责任公司 一种制动器

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19855467A1 (de) * 1998-12-01 2000-06-08 Lucas Ind Plc Vorrichtung mit schwingungsgedämpftem Bauteil, insbesondere eine Bremse
US6412880B1 (en) * 2000-03-29 2002-07-02 Honeywell Commercial Vehicle Systems Co. Combined power supply and electronic control circuit for ABS
US6302244B1 (en) * 2000-04-07 2001-10-16 The Boeing Company Brake squeal attenuator apparatus and method
US6957875B2 (en) * 2003-03-07 2005-10-25 Advics Co., Ltd. Vehicle brake squeal control device
JP4239624B2 (ja) * 2003-03-13 2009-03-18 株式会社アドヴィックス 車両用ブレーキ鳴き制御装置
JP4193557B2 (ja) * 2003-04-15 2008-12-10 株式会社アドヴィックス 車両用制動装置
FR2857935B1 (fr) * 2003-07-25 2007-05-25 Messier Bugatti Procede de freinage et frein electromecanique mettant en oeuvre ledit procede
US7232013B2 (en) * 2004-04-29 2007-06-19 Delphi Technologies, Inc. Brake force sensor
KR100954555B1 (ko) * 2004-11-23 2010-04-23 주식회사 만도 피에조 액추에이터 장착 전자제어식 브레이크 시스템
RU2555082C1 (ru) * 2014-05-19 2015-07-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Волгоградский государственный технический университет" (ВолгГТУ) Дисковый тормоз с функцией динамического гасителя колебаний

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0454324A (ja) 1990-06-22 1992-02-21 Aisin Seiki Co Ltd 車両用制動装置
JPH0454325A (ja) 1990-06-22 1992-02-21 Aisin Seiki Co Ltd 車両用制動装置
JPH06245552A (ja) * 1993-02-12 1994-09-02 Sumitomo Metal Ind Ltd 圧電アクチュエータの特性回復方法
JPH07111788A (ja) * 1993-10-12 1995-04-25 Olympus Optical Co Ltd 超音波振動子の駆動装置
EP0748947A1 (en) * 1995-06-13 1996-12-18 Sumitomo Electric Industries, Inc. Vibration damper for use in a disk brake

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6198165A (ja) * 1984-10-17 1986-05-16 Nippon Soken Inc 圧電アクチユエ−タ制御装置
DE69029628T2 (de) * 1989-09-11 1997-05-22 Nippon Denso Co Aufhängungsregelsystem
JPH0832038A (ja) * 1994-07-15 1996-02-02 Komatsu Electron Metals Co Ltd 貼り合わせｓｏｉ基板の製造方法および貼り合わせｓｏｉ基板

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0454324A (ja) 1990-06-22 1992-02-21 Aisin Seiki Co Ltd 車両用制動装置
JPH0454325A (ja) 1990-06-22 1992-02-21 Aisin Seiki Co Ltd 車両用制動装置
JPH06245552A (ja) * 1993-02-12 1994-09-02 Sumitomo Metal Ind Ltd 圧電アクチュエータの特性回復方法
JPH07111788A (ja) * 1993-10-12 1995-04-25 Olympus Optical Co Ltd 超音波振動子の駆動装置
EP0748947A1 (en) * 1995-06-13 1996-12-18 Sumitomo Electric Industries, Inc. Vibration damper for use in a disk brake

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
NISHIZAWA YUKIO ET AL: "Electronic control canceling system for a disc brake noise", PROCEEDINGS OF THE 1997 INTERNATIONAL CONGRESS AND EXPOSITION;DETROIT, MI, USA FEB 24-27 1997, vol. 1229, February 1997 (1997-02-01), SAE Spec Publ;SAE Special Publications; Overview of ABS/TCS and Brake Technology Febr 1997 SAE, Warrendale, PA, USA, pages 83 - 88, XP002075840 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 641 (E - 1639) 6 December 1994 (1994-12-06) *
PATENT ABSTRACTS OF JAPAN vol. 095, no. 007 31 August 1995 (1995-08-31) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001002744A1 (de) * 1999-07-06 2001-01-11 Robert Bosch Gmbh Verfahren zur variation der bremskraft einer fahrzeugbremse und fahrzeugbremse
KR100897111B1 (ko) * 2002-11-25 2009-05-14 현대자동차주식회사 차량의 진동소음 저감구조
DE10313990A1 (de) * 2003-03-27 2004-10-28 Daimlerchrysler Ag Verfahren sowie Vorrichtung zur Reduktion von Bremsgeräuschen
DE10313990B4 (de) * 2003-03-27 2005-10-13 Daimlerchrysler Ag Verfahren sowie Vorrichtung zur Reduktion von Bremsgeräuschen
CN106641027A (zh) * 2016-12-01 2017-05-10 陕西法士特齿轮有限责任公司 一种制动器

Also Published As

Publication number Publication date
US6125974A (en) 2000-10-03
KR19980086867A (ko) 1998-12-05
JPH10311354A (ja) 1998-11-24

Similar Documents

Publication Publication Date Title
US11767896B2 (en) Vehicle braking systems and methods
US6125974A (en) Vibration damper for vehicle brakes
EP0849484B1 (en) Vibration damper for use in wheel brake
JPH03103633A (ja) 制動装置の構成部材の平均温度を概算的に求める方法及びこの方法を実施するための装置
US5960912A (en) Vibration damper for a drum brake
US6715362B2 (en) Screwer test bench comprising a braking device for resisting torque simulation
EP0874173B1 (en) Vibration damping device
CN110715759A (zh) 车辆制动扭矩检测装置
US4334602A (en) Friction controller
JPH0454325A (ja) 車両用制動装置
CA1154843A (en) Friction controllers
US20060169554A1 (en) Vibration force switch
JP2001020984A (ja) ブレーキ装置
JP2001193770A (ja) 車両用ブレーキ装置
JP2001146931A (ja) ブレーキ装置
KR19980077646A (ko) 진동댐퍼장치
JP2000088015A (ja) ドラムブレーキ装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19990507

AKX Designation fees paid

Free format text: DE FR GB

17Q First examination report despatched

Effective date: 20010626

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20011107